chore: Remove --silent flag from layer build script and create dir prior

CI for the 10.0.0-alpha.0 release is failing at the build step but it's unclear
why. This hopefully reveals more info.

Author: andreiborza

packages/aws-serverless/scripts/buildLambdaLayer.ts

@@ -22,7 +22,11 @@ function run(cmd: string, options?: childProcess.ExecSyncOptions): string {
 async function buildLambdaLayer(): Promise<void> {
   console.log('Building Lambda layer.');
   console.log('Installing local @sentry/aws-serverless into build/aws/dist-serverless/nodejs.');
-  run('npm install . --prefix ./build/aws/dist-serverless/nodejs --install-links --silent');
+
+  console.log('Creating target directory for npm install.');
+  fsForceMkdirSync('./build/aws/dist-serverless/nodejs');
+
+  run('npm install . --prefix ./build/aws/dist-serverless/nodejs --install-links');
 
   await pruneNodeModules();
   fs.rmSync('./build/aws/dist-serverless/nodejs/package.json', { force: true });